Downhole sensor system

a sensor system and sensor technology, applied in the field of downhole sensor systems, can solve the problems of inability to accurately predict the effect of the sensor measurement, and thus the reliability of the sensor measurement, and achieve the effect of optimisation of production more quickly

Active Publication Date: 2019-04-23
WELLTEC AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The system provides accurate and reliable pressure measurements, enabling optimized hydrocarbon production by calibrating sensor data and isolating production zones, thus improving the prediction of hydrocarbon distribution and content.

Problems solved by technology

It is a problem that sensors drift over time due to the high temperatures and pressures, and the reliability of these sensor measurements is hence diminished to such an extent that accurate prediction is impossible.

Method used

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Examples

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Embodiment Construction

[0135]FIG. 1 shows a downhole sensor system 100 for measuring a pressure of a fluid downhole in a well 2. The downhole sensor system 100 comprises a well tubular structure 3 in the form of a metal casing having an inside 30 and being arranged in a borehole 4, so that an annulus 6 is defined between the well tubular structure 3 and a wall 5 of the borehole. The downhole sensor system 100 further comprises a sensor unit 7 having a pressure unit sensor 8 and the sensor unit 7 is arranged at least partly in the well tubular structure 3. The pressure unit sensor 8 is adapted to measure a pressure of the fluid in the inside of the well tubular structure 3 and / or in the annulus 6. The sensor unit 7 further comprises a power supply 9 for powering the sensor 8 and a communication module 10 for transferring the measured data from the sensor 8 to a downhole tool 11. The downhole tool 11 comprises a power supply 12, such as a battery or a wireline (shown in FIG. 3). The downhole tool 11 also co...

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Abstract

A downhole sensor system for measuring a pressure of a fluid downhole in a well, includes a well tubular structure having an inside and being arranged in a borehole with a wall and an annulus defined between the well tubular structure and the wall of the borehole, a sensor unit having a pressure unit sensor and being arranged in connection with the well tubular structure, the pressure unit sensor being adapted to measure a pressure of the fluid in the inside of the well tubular structure and / or in the annulus. The sensor unit further has a power supply and a communication module, a downhole tool with a power supply and a communication module for communication with the sensor unit. The downhole tool further comprises a pressure tool sensor adapted to measure a pressure of the fluid inside the well tubular structure substantially opposite the pressure unit sensor for comparison with the pressure measured by the pressure unit sensor.

Description

[0001]This application is the U.S. national phase of International Application No. PCT / EP2015 / 064725 filed 29 Jun. 2015 which designated the U.S. and claims priority to EP Patent Application No. 14174990.3 filed 30 Jun. 2014, the entire contents of each of which are hereby incorporated by reference.FIELD OF THE INVENTION[0002]The present invention relates to a downhole sensor system for measuring a pressure of a fluid downhole in a well. The present invention also relates to a measuring method, calibrating methods and an isolation testing method.BACKGROUND ART[0003]The distribution and content of hydrocarbon-containing fluid changes over time in a reservoir and many, more or less successful, attempts have been made to predict this development. The use of sensors measuring different fluid properties is one way of obtaining data for such prediction. The sensors are inserted into the formation along the borehole, and during measurements the sensors obtain vibrations from a seismic sour...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): E21B47/06E21B47/12E21B33/127E21B47/01E21B34/06
CPCE21B47/06E21B33/127E21B34/06E21B47/01E21B47/12
InventorHAZEL, PAUL
OwnerWELLTEC AS